Cummins head bolts are reusable, evidenced by the stretch gauge included in Cummins head gasket kits. It is a cardboard template, that measures the relaxed length of used head bolts. If the bolt is longer than the gauge, pitch it.

Is it possible that my H1D is pushing more air than my old H1C and I need to turn up my fuel? no other adjustments were touched on the pump.

I also notice my turbo now whines louder where I could barely hear it before.

I used to be able to hit 1300* with a stab of the throttle where now I barely get 1000* at WOT
Jim

Quote:

Originally Posted by Jim Lane

So I am still chasing the problem of low power, I got on the freeway tonight and under WOT I could only hit 30PSI boost and barely hit 1000* EGT, also noticed watching the camera that there was no haze or smoke out the exhaust.

Seems to me that I do not have enough fuel, weird,

I removed the injection pump when I replaced the tappet cover and got the timing it back in the same position I know this for sure.

The only variable was I had the injectors rebuilt and the turbo was rebuilt, so how would I check these?

I can turn up the pump but I had it turned down before 2 turns and I could hit 1300* in an instant.

The guy that rebuilt my turbo said he used a turbine and parts off a H1D turbo and it is now listed as a H1D on the tag so what are the differences between the H1C and the H1D when it comes to the exhaust turbine?

Could this be pushing more air than my old H1C and I just need to turn up the fuel?

Yes. But that doesn't mean that it will give you the drivability that you want.

The larger compressor can generally move a larger mass of air. But it isn't so good for generating higher pressure ratios at lower flow rates, which is what you want for responsiveness "off the line".

So far as noise, if the new compressor housing has a "Map Width Enhancing" slot and no silencer ring, it will be much louder than the stock turbo was.

I would check the afc functionaing as you describe.

Assuming there is no problem there I would turn up the fuel. Clearly you have "room" EGT-wise to turn up the fuel significantly, and the new turbo configuration should let you burn significantly more fuel, and generate more horsepower, at higher engine speeds.